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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce7e16843c6687ef0bcd1bc64fd7738427faaf5b96f4ec68859cba1898f0400f' 
  AND token = 'j2sTyp6MiJPREKcI6MbMK1MgaJe3KfQIu11sZ6PsYtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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