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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7a676695b7f16ef23965010ea0dee4b9805d4a65393eac27dd4e32be56bd8c40' 
  AND token = 'kgcPD+y9SnkzC9Yl15MmMOVeARZsFwvstr9SAo6VTL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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