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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd64703b458c48e30f30cdca62e32ae89b3cdb91d41c2e7e85893fa0522fbfe14' 
  AND token = 'Po4jdG//IYNyPR8dIzhA8CdUaoJ6tG5DPmi6yB4FVj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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