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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c5a8bd41d96d36227b292ce2251e7c5053157078eeaa35c24fcc3f48b61e6eb' 
  AND token = 'DTWxT3+wy0dFrXkVEX4VKaSrIrlQxj5DXElpXKJinWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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