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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd20732571d83efc5ad336b085de50f1b5ae9801511e93211471a0d0bdc0dfcab' 
  AND token = 'nIqutzYLnd4oLsa1so8vYnnflwXgzsupx/dUqa5w7uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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