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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9826c1d4566108b0ed6d6ae63ede32cbe625596492401533dc66f6d4919780fa' 
  AND token = 'Cl7cMxY/8NUyEeaiC+3QfN+XxLMNja3CIPz8n0sCzjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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