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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f4d539f9e669238e953c40feeb760427e5174f62736727d31aa8a345fbf7fab2' 
  AND token = 'WmXorFX8Q3uGcsH1nn5wM4x1O3EV8E448mp+1gsiSmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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