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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '226a37efc7b179c1d6d7cb14d9a0faea272ce03719182434869da602e588917b' 
  AND token = 'P/99dqH46pXc05/BPa3KMuAm6Jkl2YG9icQ2CJCQfOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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