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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e6399ea1e838395c22f56f83bfef8772e67d5bb4a0f852337637ba0a39dbb16' 
  AND token = 'ruHbSUf2BWiQjMteJosVgWGivHWYhExvibBc2TpYWCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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