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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce14ce6fbf4d3477164ec80bd5a30beb5f6d1536a563dd99154aeaee659858df' 
  AND token = 'EM0VSJip+TQntTX6l5EXBB+rJFNjIzdZBoQsomWUYrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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