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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e90b36996e533ff555a97f47cea0381a500669e526d650de38edfafc52616b33' 
  AND token = 'jmXd8Uw3y7MYqpHJFbngc5skS3Y+UokcDM68PuZQaks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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