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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d87db710946b16aba4c4a77fda5101d8fc861704e572139f9ab8b9ad098dfa7' 
  AND token = 'su5IZtUtudPez0vbPkiPXLPQQrMZ6O+Gp+4FLrqWZYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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