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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6e93577912c3771b96596fb29c2af9c59cb80edf9563d8a46c7a024ce2fccd9' 
  AND token = 'Fijpky0Fbn/VN7/RH6G4p3Mb5yvcTN8Q4g24M/HJrdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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