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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3aa13d6898e49c3594cc87cd7be5af25b76cc144f550e9cfab39f74ef87d3332' 
  AND token = 'tJcBbp1kjaxvVdiBetIkw4uGhtFBPeWnZ75vMSVaSrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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