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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02c17f23e544967f46e84ac93e4d3c9e268e7c498bef3e2fd2637eeb31579409' 
  AND token = 'H8mC37RkQJOY5DavBvcSr4UCUj26xE5F25xoFCr8eWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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