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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ca64c4c7be97eb11a625a790a02182ab90e40dd16a2d7ead829559a30247e46' 
  AND token = 'gnN2UTe5Ld2+Y9ZcTF4JQ+gjJ5FRIMs7sPYBG9F6Gq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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