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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0fcf0b554d59b0856c5c1249801cc804c1d4bffc9d386d94b432c6007d093ab2' 
  AND token = 'iSQtAOi8m9cexverReaYmNIhfV5IIQbFUJQSErP8iJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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