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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '699604c5f5c5a58e29a73a594102fd3e00ce86382ffa15ce969376d4c61b0779' 
  AND token = 'YSqzAFum50sTK0Dni7OGVng4RCOGVeylVIzT6uwfeDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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