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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67d9ef3411cf797441b4e3a4ca7a89729a6926193eb3788cc938098f70f6b562' 
  AND token = 'uJki4nacaGrmUOUPFUbyiGJm6qERogrb5Av0v0su0jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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