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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6fd6adab97f3ffb72e82d377efd281f395bab0b98e3baf822b26f883a7b46a25' 
  AND token = 'O5bzheMxve8RPod2leBULBA+m3Ey1KetFeLHI4iiJpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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