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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2fa654784449e373b5d6d8ea9b59eeea21f9177e302dff7e0e6675a6c6dea293' 
  AND token = 'Lzbz3+zU72+novRpy1Q7AD3SWpa4S4LLcnvAuBmzwAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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