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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7d111524ff7e9572d81b838dc98e3109149a5c59beb19acd020d02ee10b2f14' 
  AND token = 'HCMEAa2+RdfxV8IPldCdAL5/4bca7NUpDh6AuzDLkEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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