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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '86a984a787756bb884b1cd3929a0f858a4dd47a3a7a4cc19f2c4fe826d75f246' 
  AND token = 'DrmK49frS1A9qketX2b5DIhdSa8HShfES6pD4K6S4Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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