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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a2b5bee9043970fd18d3f4ab154ea12029645b1ac4251cd6f37ce4bd3baaee37' 
  AND token = 'YPEqnnInPBxwL11EYF4Jvg7u2jjKmW51DvDXIejYf9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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