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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '71f0bdc5f77e2f4eab9428d0072d6f5c4e53d2f351bef1d3fb43b6418ff37822' 
  AND token = 'TqEW9G25peKnqX/0aJx6fITvfvUDdJsNc4VPNdNGIS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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