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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2a83c1e0adf3db99c3b21057b26cca9c4ba5ec647781123aaa0e7193290c0d97' 
  AND token = 'rUanjpnvC4snlYxX4fUL+cKYX23qXerkaXheKA9rHHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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