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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bacacba74e92bb4189d0e8b42e05ef83a1d19fc68d75bf7e40571b1ffbc4de93' 
  AND token = 'rhEjhmcxDTZ20Rfz4cgF5dsZIKvx0uIN4UNrLX1zGog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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