SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6bc40ddc99739c5f7854765e156c6875f8576ad00935deaa33d3f82a1478cbd0' 
  AND token = 'Hiv3d9T1SmZQFYCACNv+dBk4p5Tj/W4jlxJiCOBvunY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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