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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc62bf4c8621d3dff84d96f30f50e34809e4e881a5e6ee21eb2d0bfa7394166a' 
  AND token = 'UyH+ufUjXF/oYQvHmvu50Fju7qc35SVAH462b5J0c8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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