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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19b431df60031c07bc30c6eca74b1fafe8ed881f8186f0b56fbe78f01b550440' 
  AND token = '9eqQ+5f0yE8fi9bbjmKNoXF+K8sqVU5phoMr/e3gFWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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