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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b2ea886cfeb7429c35e0f0709305af42623fdf42b092154c666f9156ab3231b8' 
  AND token = 'bqJ68h1LMku4Y25k4Ggo6e+HjjbQksGDTr0khgi5eSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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