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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '209e2e7fa11758debc296025b658ec1df0d865e0e0bd8163bb80d0382f419b64' 
  AND token = 'NOiwjYb+rPKBWm8FTYAS+2KaKeUeW3mswj1BKyP8dEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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