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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '44d2ecc22b5e2a10631892a71400504e9f633021b1e7d83f6ac6b48b4faa98f1' 
  AND token = 'zdJJRLfNATksXWT48nJEREMoHWP0+Uz+ENujKryvHPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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