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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70c769b7a4da2b1936351efa604ee1ce9933a0923e6d6ae534cdcae3575a17cb' 
  AND token = '26WFuhXrP0SlHNXU9ZLYSwGX3dZ5GSJWVUMGc5qD5EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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