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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b8f54fd392cdd7926b9c9d3b0bb5970773f971662a08ad8a1a1205cc4e90c2c3' 
  AND token = 'PYlYcOh/2nglpJf0j0D69eFY7YAFD0w1eW2m/yxREQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}