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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4cb1a4a9fd8b00fc8bb1c455f0b125be5385e46c977534e6b0b6cf7ad607eafd' 
  AND token = 'D8RlWw1x+pLxgXbgZX8oyKBlW3H7IA3Nwcr6yHBDqk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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