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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76c33975788c62744a5e5c1c2cfde6e83ea8e1ae686fcac6bebc4542d62d0a24' 
  AND token = 'wtd1OvwoiB8CFJb7sgTFcAs2VChl1QPUr2ntA0UU9g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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