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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0bd5b3addaae912961cf9799256a0a8a2e8a9125e9ba53c6732d53b55b4033c5' 
  AND token = '46GvTX5zDXfWQ/yEEXfPGcXGekPXrYHu4wDLEAov/ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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