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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '97ea046fe149822a5ad6c61a3053e49765bdbd5c4ae0b4e83844cffbc8669d5d' 
  AND token = 'gMU9rWZ7FUtc3Wa4xzq63RMkRmTxwvx9BdWMqL3/9EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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