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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '31c47346d9f0b403309d6b3201093f4e71a689dd57c864f93cec93786f0f7467' 
  AND token = 'ddQpZJQQnz/9M9X166cRn3I7QOOX3smT16R88Ve6nbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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