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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fa52fca01db2f892221cb3303e431cf8b4dcb664129acd271c2ccf40bfebd876' 
  AND token = 'v5iIYmf8+i4k+ADpxh+3bbQ0lcIA4VhrFRBmQgTAFR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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