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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a2aa139de58df93e6f5ecc76b04c4b0daa00d2f0ee772fdffa2001e4889fc4b1' 
  AND token = '6bNAugd/S7CDaRFc9tkjxGgAwOROWm2wrqdqndm/jEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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