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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5fdbafc2a2383555162038fd2be47417f5db8fed3c0b46013629af3ef4a4ba15' 
  AND token = 't7Ln3H797AUUjewVBjuizfQImeyyQnVmpV/Osw/EX7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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