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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5bc3c105dc017bd4fb1d65752e3d2361c6cb00b9e53a3734e63027027401b897' 
  AND token = 'c9250ofa1SRm3JjRBOxgI8H+Qv6MuUl3t6sj32lH0OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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