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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '62975d196c896890cd1d072f94d00f651da6be3ddd59dc8b692ff71b2750069a' 
  AND token = 'Emjq7c3F/kV7/Qu62gPjU0zJFBzBiryykkqnC0krkkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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