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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd147b7025138ab9449ad2142b6dc3c17cc06bc0ba613180b83f57480ce48ee88' 
  AND token = 'oKUa+2aH6rjhlveJfNicHvyo+iFNudar5pEgeD/J6ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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