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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19b1e63001b9d2d927f6a0178f0119e34f6145df9bd4073f85e46a832a1e02d9' 
  AND token = 'PasSXORH5p7VrOjmW7l5k3HMDRQNxMcbTvlJlORqVa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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