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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '632e2ae93dd483eb8b01efd4491bfd0ff323d756f0466bf44dfe56b392f7cd75' 
  AND token = 'FCwTAuUYPfeN5LWFftpC6jn4yp0cg3f7hghmNaYffAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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