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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '665ff0d1b63fcb662340091f6c1b1ccda90104ba2df2f4518ce01640993114e7' 
  AND token = 'jhKqdwgd/OOejfkUB5dmtgbdssRFdFyLo5s5VtP1K0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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