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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a698b2a8bed222adb167895c8ec93561654fc2ed6e0c55ea01feb8edf82fef41' 
  AND token = 'srMMtj/lQqMmlX3+rMJcL28beIBwd0puMBvRnIqfTM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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