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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '35767f4284abea86ac1576db5b99f9e34051bfd11952fd40fdfb681e2b0e4c46' 
  AND token = '8lHR39+VRr/rlV74SoF+iI1RFFw6dAj0qnMcbgCreg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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