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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd36926f77527fc1ccbbd3d32c682c4b13d0189e7e402a20deb2243daa271df8b' 
  AND token = 'fIAtOs0+ZewRTST8+E0+O5NbL5pivwlUZ1mhubKKCi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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