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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8e5a334da66c13de643346c382a1400d7dfba572de4e3d5ee42432c7be49bda' 
  AND token = 'ci5O3AKBx5kkpchUPGtG+/Cyztw503wFRcYuWaJzNds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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