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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f7cb729befe7a7bf22289fad46b21ed6177a91ddff533af5c2245b3fdb4a57d4' 
  AND token = 'uui7bHhA98hkXsbVeuoSiotH/ysecuyqqZsx6Lj9Ef0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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